Although the show lacks computer graphics that are typical of sci-fi shows (maybe due to budget constraints for TV?) this drama continues to hold its ground with the solid storyline and impressive direction and acting from a pool of very very brilliant actors. Jingoo is definitely well beyond his years as an actor, showing intensity and maturity. Kim Kang Woo is as usual, precise and forceful. Gong Seung-Yeon is not only beautiful, but she also is strong as an actress and quite effective in playing 3 personas of Byul/Jung Yeon/Bluebird. All the rest of the actors are equally brilliant and such a delight to watch. Casting is PERFECT! This drama is gripping and keeps one on his feet. As it is, it is already a masterpiece; how much better it could be when it gets more CGI? Daebak!